The IC693ACC302 Auxiliary Battery Module from GE Fanuc is designed to provide an enhanced memory backup solution for Series 90-30, Series 90-70, and PACSystems CPUs, significantly extending RAM backup duration beyond the capabilities of standard memory backup batteries. This module replaces the standard CPU RAM backup battery, offering a backup time of up to 75 months without power, with the exception of the CPU374, which supports a 15-month backup period. It is important that this unit be serviced only by trained professionals who adhere to established electrical safety practices, as user servicing is not permitted. The module features a sealed 1-Amp fuse that protects against short circuits or severe overloads. To assess potential fuse issues, the power to the PLC must be turned off and the battery unplugged before measuring connector pins for voltage using a voltmeter. A lack of voltage typically indicates a blown fuse, necessitating unit replacement. The front of the module displays a date code comprised of three digits that specifies the year and the fiscal week of manufacture; for example, a code of 315 indicates production in fiscal week 15 of 2003. It is crucial to acknowledge that these battery packs have a shelf life of approximately seven years, and any units that have been stored for an extended period should be safely disposed of according to the Material Safety Data Sheet (MSDS) accompanying the product. This auxiliary battery module operates effectively within a temperature range of 0 to 60 degrees Celsius and is compliant with cULus and CE standards.